Added movement to player and made the black hole less black.

I got feedback that said it would be better if the planets didn't move until you shoot at them, so I moved their starting positions to around the ship, and made them still at the beginning. I also got feedback saying that the ship should move, I agree with this, it's hard to shoot them in the right direction without being able to move the ship around, so I made that possible. Finally someone mentioned that the black hole was hard to see, so I made the black hole have a bunch of bright white pixels on it as well, and I added stars all over the place which do nothing but make the game look prettier and get sucked into the black hole, making it easier to see.